<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title></title>
    <script src="./vue.js"></script>
</head>

<body>
    <div id="app">
        这个游戏机是:{{price}},加价{{price1}}元,折合人民币{{price2}}元。
        <button @click="btnclick(1000)">加价1000</button>
    </div>
</body>
<script>
    var vm = new Vue({
        el: "#app",
        data: {
          price:29980,
          price1:0,
          price2:0
        },
        methods: {
        btnclick(newprice){
            this.price += newprice;
        }
            },
        watch:{
           // watch:{
                //被监听的数据(newval ,oldval)
                //相关代码逻辑
           // }
           price(newval,oldval){
            this.price1=this.price*1.08;
            this.price2=Math.round(this.price1/16.75);
           }
        }
      
    })
</script>

</html>